Green Synthesis of Dracocephalum kotschyi-Coated Silver Nanoparticles: Antimicrobial, Antioxidant, and Anticancer Potentials.

Abstract

BACKGROUND The environmentally friendly production of silver nanoparticles (AgNPs) has gained significant attention as a sustainable alternative to traditional chemical methods. This study focused on synthesizing AgNPs using extract of Dracocephalum kotschyi (D. kotschyi), a medicinal plant. MATERIAL AND METHODS The biosynthesis of AgNPs was monitored using UV-visible spectrophotometry. The role of phytoconstituents from D. kotschyi in stabilizing AgNPs was analyzed using Fourier-transform infrared (FTIR) spectroscopy. Dynamic light scattering (DLS) spectroscopy was used to determine the size, charge, and polydispersity of the nanoparticles, while scanning electron microscopy (SEM) was employed to assess their morphology. We evaluated the antimicrobial efficacy of the synthesized AgNPs against various bacteria, their antioxidant properties via a 2,2-Diphenyl-1-picrylhydrazyl (DPPH) assay, and their cytotoxic activity against the HeLa cervical cancer cell line. RESULTS The formation of AgNPs was indicated by a color change and the emergence of a surface plasmon resonance peak at 418 nm. The nanoparticles demonstrated significant antimicrobial, antioxidant, cytotoxic, and anticancer activities. Morphology, size, and shape analysis revealed nearly spherical particles with an average size of 43 nm. FTIR confirmed the presence of phenolic compounds in the extract, serving as reducing and capping agents. X-ray diffraction (XRD) analysis confirmed the crystalline structure of the nanoparticles. Antimicrobial assessments showed effectiveness against Escherichia coli and Staphylococcus aureus. The DPPH scavenging assay demonstrated efficient antioxidant activity, and potent apoptotic anticancer effects were observed on cervical cancer cells. CONCLUSIONS The extract of D. kotschyi was effective as a reducing agent in the environmentally friendly synthesis of AgNPs, which exhibited noteworthy antimicrobial, antioxidant, and anticancer properties. These findings suggest potential biomedical applications for the synthesized AgNPs.